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JMP Tremolo

PostPosted: Mon May 18, 2009 2:52 pm
by TIV
I recently aquiered an old JMP head in good working condition. Looks like it´s in the original cabinet, has later/aftermarket logo and is in good cosmetic condition. On the front it says JMP, on the back it says Tremolo 50W and below that "Jim Marshall products Ltd Serial No. T/A 2375A. Can you help me date this amp? I have not had the time to open it up yet, but I will, and post a link to lots of pictures.

Re: JMP Tremolo

PostPosted: Mon May 18, 2009 5:49 pm
by neikeel
Sounds like a 1969 or 1970 amp, but as you have guessed we need pics!

Re: JMP Tremolo

PostPosted: Mon May 18, 2009 6:32 pm
by TIV
Hi Neil, I will take pictures back and front, and also open it up and take some of the inside.
Cheers
Throstur

Re: JMP Tremolo

PostPosted: Tue May 19, 2009 2:32 am
by 908ssp
Should be a terrific sounding amp looking forward to seeing pictures of it.

Re: JMP Tremolo

PostPosted: Tue May 19, 2009 7:23 pm
by TIV
You should be able to follow this link and see lots of pictures of the JMP Tremolo "as found". http://s415.photobucket.com/albums/pp23 ... 20Tremolo/
All options and info much appreciated. Are the tranny´s original, what has been changed, what should be done to bring it back to original and are there any safety precautions I should do on it?
All the best
T
P.S. And yes... on the white label is written with pencil... 25/8/69...

Re: JMP Tremolo

PostPosted: Tue May 19, 2009 9:29 pm
by Brian Wallace
The written date is a real good indicator of the year of the amp but to make sure, can you get some codes from the remaining mustards and from the pots?

Re: JMP Tremolo

PostPosted: Wed Jul 08, 2009 12:17 pm
by neikeel
I am confused!

Metal panel with valve rectifier?

Can someone explain? :oops:

Re: JMP Tremolo

PostPosted: Thu Jul 09, 2009 2:13 am
by 908ssp
I don't think that is stock. I think the tube rectifier is a retro fit along with the power transformer. Look at the terminal strip in the chassis and the mess the PT wires are in not Marshall I say. All those extra caps inside make up for the one removed from the chassis where the rectifier tube is.